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Checking for file update

jaxrpc asked
Medium Priority
Last Modified: 2010-04-23
Hi, i have a txt file....how can i in vb.net check whether it has been modified? I think it will be like a function which will check the the txt file every 1 sec and returns a boolean when it has been modified... but are there any built in functions to do that? Please point me to the right direction. thanks
Watch Question

you can read Modified date and time of the file property
TimCotteeHead of Software Services
Hi jaxrpc,

Add this to the declarations section    
        Private watcher As FileSystemWatcher

Then in your form_load
        watcher = New FileSystemWatcher()
        watcher.Path = "c:\Myfoldertowatch"
        watcher.NotifyFilter = (NotifyFilters.LastAccess Or NotifyFilters.LastWrite Or NotifyFilters.FileName Or NotifyFilters.DirectoryName)
        watcher.Filter = "MyFileToWatchFor.txt"
        AddHandler watcher.Changed, AddressOf OnChanged
        watcher.EnableRaisingEvents = True
Then add the event so we can handle when it has changed.
    Private Shared Sub OnChanged(source As Object, e As FileSystemEventArgs)
        Msgbox ("The file has changed")
    End Sub    

Tim Cottee

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Dim selectedFile As String = FilesList.Text
        Dim FI As New FileInfo(Directory.GetCurrentDirectory & "\" & selectedFile)

        lblInfo.Text = "File Name:" & FI.Name & vbCrLf & _
                       "Length:" & FI.Length.ToString & vbCrLf & _
                       "Extension:" & FI.Extension.ToString & vbCrLf & _
                       "Creation Time:" & FI.CreationTime.ToString & vbCrLf & _
                       "Accessed:" & FI.LastAccessTime.ToString
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